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Finance Receivables - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Recorded Investment, Nonaccrual Status $ 694 $ 682    
Consumer Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables 27,330 25,623    
Consumer Finance Receivables [Member] | North America Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables 15,490 13,361    
Consumer Finance Receivables [Member] | Deteriorated Credit Quality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables 269 459    
Commercial Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables 7,815 8,072 $ 7,114 $ 6,700
Commercial Finance Receivables [Member] | North America Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables $ 3,515 $ 3,180 $ 2,373 $ 1,975